Leedy, Paul D. Practical research : planning and design / Paul D. Leedy,Timothy J. Newby ,Peggy A. Ertmer. - 6th ed. - Upper Saddle River, N.J. : Merrill, c1997. - xvi, 304 p. : ill. ; 28 cm. .Includes index Includes bibliographical references ISBN: 9780132414074 Subjects--Topical Terms: Research--Methodology. LC Class. No.: Q180.55.M4 / L43 1997 Dewey Class. No.: 001.4 / LPP